linux-kernel - Re: Fwd: PROBLEM: tpm_cpg can't request region with AMD/Dell fTPM

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Date:   Sat, 11 Aug 2018 00:44:48 +0300
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Harlan Lieberman-Berg <harlan@....mil>
Cc:     Peter Huewe <peterhuewe@....de>, linux-integrity@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-security-module@...r.kernel.org
Subject: Re: Fwd: PROBLEM: tpm_cpg can't request region with AMD/Dell fTPM

On Fri, Aug 10, 2018 at 07:57:35PM +0300, Jarkko Sakkinen wrote:
> On Tue, Aug 07, 2018 at 02:43:10PM -0400, Harlan Lieberman-Berg wrote:
> > (Resending as it seems to have been spamfiltered out from the ml;
> > sorry Peter, Jarkko for the duplicate)
> 
> I came on Monday from four week leave and have been basically been
> catching up with my emails :-) I'll look into this next week with
> time.

The error message is saying that someone else has reserved the resource
(-EBUSY).

This looks odd:

e78bf000-e7bbefff : ACPI Non-volatile Storage
  e7bb6000-e7bb9fff : MSFT0101:00
  e7bba000-e7bbdfff : MSFT0101:00

Why would be TPM registers mapped inside ACPI NV?

I would *guess* that what is happening is that perhaps drivers/acpi/nvs.c
maps the address space. This looks like a firmware bug, and such that we
cannot do anything about it.

I'm having a weird issue with the ACPI tables:

$ acpixtract acpidump.txt

Intel ACPI Component Architecture
ACPI Binary Table Extraction Utility version 20180105
Copyright (c) 2000 - 2018 Intel Corporation

  DSDT -   31048 bytes written (0x00007948) - dsdt.dat
  SSDT -     349 bytes written (0x0000015D) - ssdt1.dat
  SSDT -   18086 bytes written (0x000046A6) - ssdt2.dat
  SSDT -    5225 bytes written (0x00001469) - ssdt3.dat
  SSDT -    1082 bytes written (0x0000043A) - ssdt4.dat
  SSDT -    1017 bytes written (0x000003F9) - ssdt5.dat
  SSDT -    5369 bytes written (0x000014F9) - ssdt6.dat

$ iasl -d *.dat   

Intel ACPI Component Architecture
ASL+ Optimizing Compiler/Disassembler version 20180105
Copyright (c) 2000 - 2018 Intel Corporation

Input file dsdt.dat, Length 0x7948 (31048) bytes
Table [DSDT] is too long for file - needs: 0x815D, remaining in file: 0x7948
Could not get ACPI tables from dsdt.dat, AE_BAD_HEADER

This has not happened to me before.

/Jarkko